Hi all i am working on NXP ISP1760 usb chipset. My board is having Davinci
DM6446 processor.

I am able to enumerate the internal hub properly. When ever i plugin any
device in to the usb host, the detection of insert and removal itself is
not happening.

I have done the following,

1) Mounted usbfs on /proc to know whether the internal hub is proper.
2) Traced out all the atl ptd transactions. All the atl transactions are
success.
3) Finally, after enumerating the internal hub, the IN urb from usbcore
is submitted to the Interrupt IN enpoint of the hub, to detect the hub
status change.
The following is the packet transaction log of interrupt IN urb,
----------------------------------------------------
Submitted the IN request to hub INendpoint
Formed qtd: Len:1 PacketType:1 Data:cf9dbac0
+ Enqueing one int_qtd +
--PTD descriptor data--
DW0: a0040009
DW1: 3410
DW2: 18000
DW3: 81000000
TOGGLE: 0
--Payload address:1000--
--Filling int_ints Slot number 0--
- Enqueued one int_qtd -
------------------------------------------------------

I persume that Dw0 to dw3 values are right and writtern correctly,
because these are directly handled by the driver.

4) All of the external 3 ports is powered on, this is the hub status
that iam getting on the three external ports.

hub 1-1:1.0: port 1: status 0100 change 0000
hub 1-1:1.0: port 2: status 0100 change 0000
hub 1-1:1.0: port 3: status 0100 change 0000

The hub status is pretty standard as in any other usb with the device
not connected.

5) I am using the digital overcurrent mode in isp1760. although we are
using a 500mA fuse to monitor the port power. So, OCx_N are terminated
with 10K resistors and the pswx_N pins are left open(which is suggested by
NXP). If i try to choose analog overcurrent mode, i am getting an
overcurrent error.

6) After the usbcore submits the IN urb to hub for montioring the hub
connect status, the In urb is translated to interrupt qtds, and then it is
written properly to the isp1760. But when i connect any device to usb
host, the interrupt is supposed to be triggered by the isp1760, which will
check the intdone map, and transfer the hub status data to the IN urb, this
inturn calls the completion handler, which will trigger hub_irq to choose
what actions to be taken according to the port status and port change.
But in my case, i am not getting any interrupt from the isp1760 when i
connect device


7) This is my register dump of isp1760 immediately after submitting the
IN urb,

+ REGISTER DUMP +
+ --EHCI REG-- +
CAPLENGTH: 1000020
HCIVERSION: 110100
HCSPARAMS: 11
HCSPARAMS: 86
+ --EHCI OPERATIONAL REG-- +
USBCMD: ff0b01
USBSTS: c
USBINTR: 0
FRINDEX: 3436
CTRLDSSEGMENT: 0
CONFIGFLAG: 1
PORTSC1: 1005
ISO PTD Done Map: 0
ISO PTD Skip Map: ffffffff
ISO PTD Last PTD: 1
INT PTD Done Map: 0
INT PTD Skip Map: ffffffff
INT PTD Last PTD: 80000000
ATL PTD Done Map: 0
ATL PTD Skip Map: ffffffff
ATL PTD Last PTD: 80000000
+ --CONFIGURATION REGISTERS-- +
HW Mode Control: ffff7eff
Chip ID: 11761
Scratch: 0
SW Reset: ffff0000
DMA Configuration: 0
Buffer Status: 1
ATL Done Timeout: 0
Memory: 10400
Edge Interrupt Count: f
DMA Start Address: 0
Power Down Control: 17e81ba0
Port 1 Control: 1e001e
+ --INTERRUPT REGISTERS-- +
Interrupt: 3
Interrupt Enable: 188
ISO IRQ Mask OR: ffffffff
INT IRQ Mask OR: 0
ATL IRQ Mask OR: 0
ISO IRQ Mask AND: 0
INT IRQ Mask AND: 0
ATL IRQ Mask AND: 0
+ END OF REGISTER DUMP +


If someone has experience with isp1760, please help me up in this issue.

Thanks in advance.